An experiment with ISO

Today the house is quiet, (apart from the plumber as we are having a new bathroom installed) so i decided to have an experiment with the ISO settings on my camera. I have an image in my mind that i am working towards, i think i need more experience behind the camera before it will come out, please keep in mind i have only been using a digital camera for the past 10 months, so i have been taking bracketed photos of my hearth at different ISO to see what would happen. (I do know, i just want to SEE it)
So for those in the know, skip this part or add your own comments. What is ISO? Not to make me look stupid i went to http://www.geek.com/digital-camera-buyers-guide/iso/ and asked them. Their reply was ‘Simply put, ISO is the measurement of a camera’s sensitivity to light. The higher the ISO number the more sensitive the sensor is. A higher ISO number means that a camera will be able to shoot images in conditions with less light. ‘ But we know that a high ISO means noise BUT can that noise be useful in a photograph or not? Below i have five photos of my hearth each bracketed to a correct exposure, -2, +2 and using a different ISO setting. I then loaded them into photomatix and used the tone mapping and creative button.

This image is at 100ISO

 

 

 

 

 

 

This image is at 200ISO

 

 

 

 

 

 

This image is at 400ISO

 

 

 

 

 

 

This image is at 800ISO

 

 

 

 

 

 

and this image is at 1600ISO

 

 

 

 

 

 

The images become more and more ‘noisy’ especially in the blacks, so i guess that is why we always use 100ISO if possible!

I used tonemapping as i want to get as close to the image that our eye see’s as possible, this is why i am experimenting, i want to be able to produce HDR images that look like the real deal, not something thats been tinkered with in photoshop. I think i am getting there, i know that at some point i will need to update my camera for one that automatically brackets the exposures as you do get movement when you do it manually. But for know i am content to experiment and hone my skill with what i have.

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